Huh.. so the bizzare thing is I do not have a modified BIOS, but running
the patcher fixed the problem..
Thank you all very much for your inputs
You need install patch
https://www.monitortests.com/forum/Thread-AMD-ATI-Pixel-Clock-Patcher
It's because of modified bios.
http://www.overclock.net/t/1604567/polaris-bios-editing-rx5xx-rx4xx
https://www.monitortests.com/forum/Thread-AMD-ATI-Pixel-Clock-Patcher
It's because of modified bios.
http://www.overclock.net/t/1604567/polaris-bios-editing-rx5xx-rx4xx
the patcher fixed the problem..
Thank you all very much for your inputs